pre-push

#!/bin/bash
protected_branches=( main )
for i in "${protected_branches[@]}"
do

    protected_branch=$i

    policy='[Policy] Never push, force push or delete the '$protected_branch' branch! (Prevented with pre-push hook.)'

    current_branch=$(git symbolic-ref HEAD | sed -e 's,.*/\(.*\),\1,')

    push_command=$(ps -ocommand= -p $PPID)

    is_destructive='force|delete|\-f'

    will_remove_protected_branch=':'$protected_branch

    do_exit(){
      echo $policy
      exit 1
    }

    if [[ $push_command =~ $is_destructive ]] && [ $current_branch = $protected_branch ]; then
      do_exit
    fi

    if [[ $push_command =~ $is_destructive ]] && [[ $push_command =~ $protected_branch ]]; then
      do_exit
    fi

    if [[ $push_command =~ $will_remove_protected_branch ]]; then
      do_exit
    fi

    if [[ $protected_branch == $current_branch ]]; then
      do_exit
    fi

done

unset do_exit

exit 0